Solution:
- The verb 'to put' (ставить) in the poem is used in the meaning of 'to install' or 'to set'. This is evident from the examples given in the poem, such as 'A fitter puts meters' (Ставит счётчики монтёр), which implies the action of installing or setting something in place.
- From the reference words, the closest synonyms are 'устанавливает' (installs) and 'определяет' (determines, in the sense of setting a value or condition). 'Делает' (makes) is also a possibility in a broader sense, like making a diagnosis.
Answer: устанавливает, определяет, делает